Marion County, MO follows the Missouri statutory schedule. This page shows that schedule, the county's own website, and the late penalty — the county can still set its own dates, so confirm before you pay.
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…until annual — January 1, 2027
Instalment
Due date
Notes
Annual
January 1, 2027
Taxes are payable on or before December 31, and unpaid real estate is delinquent on January 1.
Schedule: www.revisor.mo.gov · Missouri statute · not yet county-verified
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Statewide schedule — read this before you rely on it
The December 31 date is uniform statewide, but charter counties and St. Louis City run their own tax-sale and payment-plan calendars, and partial opt-in counties use a separate foreclosure track. Most counties in this state follow these dates.
Delinquent land is charged an 18% penalty on each year's delinquency plus interest, and the collector enforces the state's lien.
Collectors mail bills in the fall once the levy is set, and payment is due by December 31.
Marion County at a glance
Population: 28,336 (Census estimate, 2023) — the 39th largest of 115 Missouri counties and county equivalents.
Typical tax bill: $1,308 a year (median for owner-occupied homes, ACS 2022 5-year estimate) — the Missouri median is $1,812.
Land area: 436.9 sq mi, about 64.9 people per sq mi.
County website:marioncountymo.com — start here for the treasurer or tax collector page.
By post: mail to the county treasurer; the postmark usually counts, not the arrival date.
In person: the treasurer's office, with your bill or parcel number.
Escrow: if your mortgage escrows taxes, the servicer pays — you still owe any shortfall.
Is this county verified?
Not yet. Marion County is on the queue: we publish a county's own published dates once they have been checked against the county website. Ask for it and it moves up. Until then, the Missouri statutory schedule above is the reliable starting point.
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StacyApproved is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.